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- Lowering of a reservoir's water level; process of depleting a reservoir or ground water storage. The drop in the water table or level of water in the ground when water is being pumped from a well. Vertical distance the free water surface elevation is lowered or the reduction of the pressure head due to the removal of free water. The difference between a water level and a lower water level in a reservoir within a particular time. The amount of water used from a reservoir.
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- Brake horsepower, Capillary head, Cavitation, Cirque, Head, Pressure head, Sluice, Static head, Unbalanced head., Vortex